the obama administration imposing tough sanctions already. >> i will not hesitate to impose new sanctions on iran and will tighten the sanctions we currently have. >> reporter: the obama campaign asking just what would those new sanctions be and on libya after the attack in benghazi that killed four americans including ambassador chris stevens, blistering words for the obama administration. >> this latest assault can't be blamed on a reprehensible video insulting islam despite the administration's attempts to convince us of that for so long. no, the administration has finally conceded these were the deliberate work of terrorists. >> reporter: romney said today he would vigorously pursue the terrorists. president obama has said he is doing the same thing and the obama campaign trying to remind voters of romney's first reaction criticizing the president as the attack was unfolding. >> our u.s. diplomats were attacked in libya the oba-- >> up in virginia. the campaign arguing voters should know that romney's time line for afghanistan is the same that romney wants to get more deeply involved